MQTT Communication # Greengrass V2

Question

Hi Team,

Is it possible to respond to same device who has send message to IoT Core in Greengrass v2 ??

My scenario is I am sending one message on AWS IoT Core and that message has been routed via rules to make a call to Lambda. I have some logical implementation in lambda which would return pre-signed URL which I want to send back to same **thing/device** who has sent message to IoT Core. Since, I have multiple **devices/things**, I don't want that message should be **accept by other devices**.

Is there any provision to handle such scenario ??

Accepted Answer

You should be able to get a thing name from an env variable `AWS_IOT_THING_NAME` inside a GGv2 component  and construct a topic which looks something like this `AWS_IOT_THING_NAME/message/response` where you can send the back the info to.
You will also have the info from which topic the message got received into in a lambda function payload, thus you can know where to send it back.

MQTT Communication # Greengrass V2

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